{
JPG = 255216,
GIF = 7173,
BMP = 6677,
PNG = 13780,
}
public static bool IsAllowedExtension(FileUpload fu, FileExtension[] fileEx)
{
int fileLen = fu.PostedFile.ContentLength;
byte[] imgArray = new byte[fileLen];
fu.PostedFile.InputStream.Read(imgArray, 0, fileLen);
MemoryStream ms = new MemoryStream(imgArray);
System.IO.BinaryReader br = new System.IO.BinaryReader(ms);
string fileclass = "";
byte buffer;
try
{
buffer = br.ReadByte();
fileclass = buffer.ToString();
buffer = br.ReadByte();
fileclass += buffer.ToString();
}
catch
{
}
br.Close();
ms.Close();
foreach (FileExtension fe in fileEx)
{
if (Int32.Parse(fileclass) == (int)fe)
return true;
}
return false;
}
/// <summary>
/// 调用
/// </summary>
protected void Button1_Click(object sender, EventArgs e)
{
string msg = "false";
FileExtension[] fe = { FileExtension.BMP, FileExtension.GIF, FileExtension.JPG, FileExtension.PNG };
if (IsAllowedExtension(FileUpload1, fe) == true)
{
//上传
msg = "true";
}
MessageBox.Show(this, msg);
}
